package net.lzzy.practices.services;

import net.lzzy.practices.entities.User;
import net.lzzy.practices.repositories.UserProjection;
import net.lzzy.practices.repositories.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.UUID;

/**
 *@author lzzy_gxy on 2022/5/9.
 *Description:
 */
@Service
public class UserServiceImpl  implements UserService{
    private final UserRepository repository;
    @Autowired
    public UserServiceImpl(UserRepository repository){
        this.repository=repository;
    }
    @Override
    public User check(String userName, String password) {
        return repository.findUserByUserNameAndPassword(userName,password );
    }

    @Override
    public boolean isUserNameOccupied(String userName ) {
        return repository.countByUserName(userName)>0;
    }

    @Override
    public User register(User user) {
        return repository.save(user);
    }

    @Override
    public List<User> get() {
        return repository.findAllByOrderByUpdateTimeDesc();
    }

    @Override
    public List<User> get(int page, int size) {

        return repository.findAllByOrderByUpdateTimeDesc(PageRequest.of(page,size));
    }

    @Override
    public User getById(UUID id){
        return repository.findById(id).orElse(null);
    }
    @Override
    public Integer count() {
        return repository.countAllBy();
    }

    @Override
    public List<User> search(String kw) {
        return  repository.findByQuery(kw);
    }

    @Override
    public List<User> getApplying(boolean applying) {

        return  repository.findUsersByApplyTeacherOrderByUpdateTimeDesc(applying);
    }

    @Override
    public User approveTeacher(UUID id) {
        //findById是eager,getById 是延迟查询
        User user= repository.findById(id).orElse(null);
        if(user!=null){
            user.setType(User.TYPE_TEACHER);
            user.setApplyTeacher(false);
            return repository.save(user);
        }
        return null;
    }

    @Override
    public User declineTeacher(UUID id) {
        User user= repository.findById(id).orElse(null);
        if(user!=null){

            user.setApplyTeacher(false);
            return repository.save(user);
        }
        return null;
    }

    @Transactional(rollbackFor = Exception.class)
    @Override
    public User banUser(UUID id) {
        User user= repository.findById(id).orElse(null);
        if(user!=null){
            user.setType(User.TYPE_BANNED);
            user.setApplyTeacher(false);
            return repository.save(user);
        }
        return null;
    }

    @Override
    public String getSalt(String userName) {
        List<UserProjection> salts=repository.findUsersByUserName(userName);
        if (salts==null||salts.size()==0){
            return "";
        }UserProjection projection=salts.get(0);
        if(projection==null){
            return "";
        }
        String salt=projection.getSalt();
        return salt==null?"":salt;
    }
}
